Impeller for centrifugal pumps



i Oct. 16, 1923. 1,470,607

J. S. HAZELL IMPELLER FOR CENTRIFUGAL PUMPS Filed Nov. 3. 1922 Wziness e .9: [raven/Z01 Jozm s amz y Hazel! 8X. 3] his diz y,

Patented Oct. l6, 1923.

UNITED STATES PATEN JOHN STANLEY HAZELL, OF LONDON, ENGLAND, ASSIGNOR TO UNCHOKEABLE PUMP,

nmnrnn, OF LONDON, ENGLAND.

IMPELLER FOR CENTRIFUGAL PUMPS.

Application filed November 3, 1922. Serial No. 598,921.

T all whom it may concern:

Be it known that I, JOHN STANLEY HAzELL, a subject of the King of Great Britain, residing 1n London, England, have ine vented certain new and useful Improvements in Impellers for Centrifugal Pumps, of which the following is a specification.

This invention relates to impellers for centrifugal pumps and refers to balanced im- 1 pellers having a single port or passage for the li uid.

Wit impellers of the type referred to it is sometimes found advisable, in order to secure the most efiicient results per horse 36 power of the engine driving the pump, that the diameter of the impeller be reduced.

' In practice, with pumps of this type as at present constructed, no provision is made whereby this may be readily effected withm out destroying the balance of the impeller.

In ractice hitherto in order to meet this diilicu ty it has been usual to provide pat- I terns of different diameter from which castings may be obtained of impellers of the desired diameter.

Such a course as that just referred to is obviously impractical from a commercial point of view as it necessitates the making of a comparatively large number of atterns no difl'ering, in some instances, on y very slightly in diameter.

The present invention has for its object certain improvements in impellers of the single ported balanced type whereb not :5 only may the diameter of the impel er be readily reduced to the desired extent but this may be effected without interfering with the balance of the im eller.

In order that t e invention may be the 4.0 better understood drawings are appended in which Fig. 1 is a side view of an impeller em bodymg the present invention,

Fig. 2 is a section on line A. A Fig. 1. Referring to the accompanying drawings 0 indicates the im Her, I) the single port or assage therein or the liquid and m the balancing chamber.

The chamber a is shown closed but if desired the cover e may be omitted and the chamber or cavity left open.

Provision may be made for introducing liquid into the closed chamber, for example a plugged aperture such as indicated in dotted lines, at i may be provided for this purpose.

Surrounding the impeller upon one or both sides thereof and disposed upon the outer edges of the side members of the impeller is a thickened portion 0.

d indicates smaller blades or vanes which in addition to imparting an additional impulse to the liquid in the pump casing also tends to balance the heavy metal surrounding the mouth of the port.

In order to vary the diameter of the impeller to meet varying conditions of service it is only necessary to remove the metal from the circumference, by turning in a lathe for example.

in the turning operation metal is also removed from the lades or vanes d the amount removed being proportionate to the amount removed from the body of the impeller. By this means the balance is preserved.

By this means a single pattern may serve to produce a large number of impellers and the necessity of providing a number of patterns is avoided, and further any adjustment of the balance which would otherwise be necessary is also avoided.

laims:

1. A single ported impeller for centrifugal pumps, means for balancing said impeller comprisin a plurality of blades upon the sides of t e impeller extending to the periphery thereof whereb the diameter of the impeller may be varie without destroying the balance.

2. A single ported impeller for centrifugal pumps, means for balancing said impeller comprising an annular thickened portion u on the periphery of the im eller, a plurality of blades upon the sides 0 the impeller extending to the periphery whereby the diameter of the impeller may be varied without destroying the balance thereof.

3. A single ported impeller for centrifugal pumps, means for balancing said impeller comprising an annular thickened portion upon the periphery of the impeller, a plurality of blades upon the sides of the impeller extendin to the periphery whereby the diameter 0 the impeller may be varied without destroying the balance thereof, 105 said blades having surfaces designed to impart an additional impulse to the liquid in the pump casing. 4

4. A single ported impeller for centrifugal pumps, a cavity in said impeller open on one side to permit the entry of the liquid thereto when the impeller is running and thereby assist in the balancing of the impeller, other balancing means comprising a plurality of blades upon the. sides of the impeller extending to the periphery thereof whereby the diameter of the impeller may be varied without destroying the balance.

5. A single ported impeller for centrifugal pumps, a cavit in said impeller open on one side to permit the entry of the liquid thereto when the impeller is running and thereby assist in the balancing of the impeller, other balancing means comprising an annular thickened portion upon the periphery of the impeller, a plurality of blades upon the sides of the impeller extending to the periphery whereby the diameter of the impeller may be varied without destroying the balance thereof.

6. A- single ported impeller for centrifugal pumps, a cavity in said impeller open on one side to permit the entry of the liquid thereto when the impeller is running and thereby assist in the balancing of the impeller other balancing means comprising a plurality of blades upon the sides of the impeller extending to the eriphery whereby the diameter of the impe ler may 'be varied without destroying the balance thereof, said blades havin surfaces designed to impart an additional impulse to the liquid in the pump casing.

7. A single ported impeller for centrifugal pumps, a cavity in said impeller, a closure for said cavity, means permitting the introduction of liquid into said closed cavity to balance the impeller, other balancing means comprising a plurality of blades upon the sides of the impeller extending to the periphery thereof whereby the diameter of the impeller may be varied without destroying the balance.

8. A single ported impeller for centrifugal pumps, a cavity in said impeller, a closure for said cavity, means permitting the introduction of liquid to said closed cavity to balance the impeller, other balancing means comprising an annular thickened portion upon the periphery of the impeller, a plurality of blades upon the sides of the impeller extending to the periphery Whereb the diameter of the impeller may be varied without destroying the balance thereof.

9. A single ported impeller for centrifugal pumps, a cavity in said impeller, a closure for said cavity, means permitting the introduction of liquid into said closed cavity to balance the impeller, other balancing means comprising a plurality of blades upon the sides of the impeller extending to the periphery whereby the diameter of the impeller may be varied without destroying the balance thereof, said blades having surfaces designed to impart an additional impulse to the liquid in the pump casing.

In testimony whereof I have hereunto set my hand in the presence of two witnesses.

JOHN STANLEY HAZELL.

Witnesses:

C. HAROLD HEATHCOTE MAJIS, A. S. STAPFORTH. 

